Newbie: How do I get dir listings from applets?

[Frank Lümkemann]

I want to access image files contained in a directory, and I would like to scan the whole directory. When I use the appletviewer, the following code gives me a list of the files in the dir, but not with Netscape. I think the security manager throws an exception, but how can I access a directory from an applet then?
 
thank's for your help!
 
    Frank
 
  private void scan_directory() {
 
        dialog = new SimpleFileDialog(this, "Select a file!");
        dialog.show();
        PrintWriter out = new PrintWriter(System.out, true);
 
        try {
 
            File dir = new File(dialog.getDirectory());
            String str = new String(dialog.getFile());
            char c = str.charAt(0);
 
            setText("Directory: " + dialog.getDirectory());
 
            for (int i = 0; i < dir.list().length; i ++) {
                    setText("File " + i +": " + dir.list()[i]);
            }
        } catch (Exception ev) {
            FileButton.window.dispose();
            out.println("keine datei geladen...(EXC)!");
 
        }
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